Modified Gauss–Bonnet gravity with radiating fluids

Radiating sources in higher-dimensional gravity

We extend previous work on radiating, spherically-symmetric sources such as stars in general relativity by analyzing a class of 5D Kaluza-Klein metrics which contains physically relevant 4D metrics. We present two exact solutions. This approach can be used to obtain 4D solutions from 10D superstrings, 11D supergravity and M-theory. PACS number(s): 04.20.Jb, 11.10 Kk Email: [email protected] Ema...

Simulating Fluids in Zero Gravity

A lot of research has been conducted on achieving realistic fluid simulations: waves, flow, waterfalls, etc. This paper focuses on a less talked about aspect of fluid simulation: the behavior of liquids in zero gravity. Unlike in most other situations which are dominated by gravity, surface tension becomes the key phenomenon of the simulation. A spring-connected system of particles is used to m...

Radiating black hole solutions in Einstein-Gauss-Bonnet gravity

In this paper, we find some new exact solutions to the Einstein-Gauss-Bonnet equations. First, we prove a theorem which allows us to find a large family of solutions to the Einstein-Gauss-Bonnet gravity in n-dimensions. This family of solutions represents dynamic black holes and contains, as particular cases, not only the recently found Vaidya-Einstein-Gauss-Bonnet black hole, but also other ph...

Modified gravity and cosmology

Viscosity in Modified Gravity

A bulk viscosity is introduced in the formalism of modified gravity. It is shown that, based on a natural scaling law for the viscosity, a simple solution can be found for quantities such as the Hubble parameter and the energy density. These solutions may incorporate a viscosity-induced Big Rip singularity. By introducing a phase transition in the cosmic fluid, the future singularity can nevert...